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Dynamical Friction in Barred Galaxies

Published online by Cambridge University Press:  12 April 2016

Victor P. Debattista
Affiliation:
Rutgers University, PO Box 849, Piscataway, NJ 08855
J. A. Sellwood
Affiliation:
Rutgers University, PO Box 849, Piscataway, NJ 08855

Extract

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Weinberg’s (1985) perturbative calculation of the dynamical friction by halos on bars predicts that bars will be slowed down very quickly. Previous numerical experiments (e.g. Hernquist & Weinberg 1992) have obtained results that are in agreement with Weinberg’s calculation.

Observations, however, suggest that most bars are rotating rapidly. (In this context, a bar is slow if the major axis Lagrange point is far outside the bar, while a fast bar ends at, or near, this Lagrange point.) Neither Weinberg’s calculation nor the numerical experiments have, to the present date, been fully self-consistent, so possibly important effects such as resonance capture and the back reaction on the bar were not included.

Type
Posters of Part V and Part VI
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

Hernquist, L. & Weinberg, M. 1992 ApJ, 400, 80 Google Scholar
Kormendy, J. 1979, ApJ, 227, 714 Google Scholar
Weinberg, M. 1985, MNRAS, 213, 451 CrossRefGoogle Scholar